Is there a way of automatically drawing bounding boxes around interested objects?
How many classes do you want to annotate it?

We can get the bounding boxes and class names coarsely by using the pre-trained models such as YOLO-V3 darknet, SSD and others.

Then, we can load those annotations using the tool labelImg and manually correct it. It reduces the lot of work and it is called the Human-AI labeling technique.